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--Could you tell me ____?-- Sorry,I've no idea.I have just c

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--Could you tell me ____?-- Sorry,I've no idea.I have just come back.
选项为:
A.what is the matter with Tom?
B.what had happened to Tom
C.where Tom was
--Could you tell me ____?-- Sorry,I've no idea.I have just c
选A,B的与意思不符,不能选,主句的Could不是can的过去式哦!而是表示委婉的语气,所以不是一般过去式,而C用了过去式,自然就错了,故选择A,时态和语序都没有错